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| Upper/lower Kelly Cock |
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 ¡¡¡¡Kelly cock valve is a constant-open type blowoutprotection assembly in drilling tool, as well kick happens,it can be closed and prevent fluid under ground fromgushing up through the water hole in drilling column. Inwell control operation, if hose and high-pressure mani-fold is damaged, it can be replaced in safety under thevalve being closes.
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Upper cock adopts left hand thread but the loweradopts right hand thread, and they are identical instructure of ball valve.
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Appliances
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The rated working pressure of Kelly cock valveshould be equal to the rated pressure of BOP, the ID ofcock should be larger than (or equal to) the ID of Kelly rod, Max working pressure and test pressure should betested according the requirement listed in the belowtable,Holding pressure for 3 minutes without leakage isconsidered as a qualified sealing test, appliance for cockis up to 82OC and the cock wrench should stay the avail-able/usable position.
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Feature£º
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Upper cock valve consists of valve body, upper/lower seat, ball body, rotary-block, retainer, spring andnon-metal seals etc.
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Valve body is ASTM4140 forging, and the machin-ery properties after heat treatment can meet the require-ment of API Spec 7.
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Valve seat and ball body are made of heat-resis-tant stainless steel with abrasion and corrosionresistance.
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The valve is single direction seal, as the valve isclosed, under the co-reaction of fluid pressure underwell and pre-load spring pressure, the ball body ap-proaches to the back-seat quickly so as to create a seal.As for the sealing face of back-seat adds a PTFE non-metal ring and reduce the compact of ball body to valveseat,So that it should have more reliable performance.
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The surface of the valve body stamped with visiblesign of " open" or " close' indicates the open/close stationof cock valve obviously
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ÃÜ·âÊÔÑéѹÁ¦(Mpa) |
ÊÔÑéѹÁ¦(Mpa) |
35 |
¡Ý35 |
70 |
35 |
¡Ý70 |
105 |
35 |
¡Ý105 |
157.5 |
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Parts List£º
Item |
Component |
Qty |
Material |
Remark |
1 |
Handle |
1 |
45 |
|
2 |
Rotary-block |
1 |
30CrMo |
|
3 |
O-Ring |
1 |
NBR |
|
4 |
Body |
1 |
40CrMnMo |
|
5 |
Spring |
8 |
65Mn |
|
6 |
Lower Seat |
1 |
2Cr13 |
|
7 |
Ball |
1 |
2Cr13 |
|
8 |
Lower Retainer |
1 |
2Cr13 |
|
9 |
O-Ring |
1 |
NBR |
|
10 |
Upper Seat |
1 |
2Cr13 |
|
11 |
Upper Retainer |
1 |
30CrMo |
|
12 |
Retainer |
1 |
2Cr13 |
|
13 |
Circlip |
1 |
65Mn |
Standard |
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